Chimney flue cover



Aug. 29, 1933. J JOHNSON 7 1,924,437

CHIMNEY FLUE COVER Filed Aug. 17, 1932 d h S,

Patented Aug. 29, 1933 Q eater crumm FLUECOVEB Jolm .A...Johnson,' (Jrawfordsville,:1nd;zassignors lj to National Supply; Service Corporation A plication August -17','1932. -seriai Noe-629,106? i V 8 Claims. (015126-319) The commonpracticeinj closing flue openings in a wall is 'withfa metal shield which becomes red hot at times and often results in damage. by'

. fire to the building or to'the wallpaper or other ,decorations, andia principal object of this in- V eliminate ll fire hazard.

Often the flue opening or the thiin'ble therein 'vention is to'providea fiu'e holelstop' that will is irregular ,orout of round makingthe a'ppli cation of a symmetrical violosing device impractical insofar asjeffe'cting a complete closure of the opening is concerned, (and another important object of my invention" is to provide a stop that can be. easily applied to completely close any opening. regardless of its distorted shapepr condition.

My invention contemplates theme of. an

outside wall plate, an expansiblerefractoryheat insulating .material .the opening between t the plate and flue and an" object of my invention isto provide means operated from in front of the plate for expanding ordiametrically extend- 7 ing the refractory material.

Another object is to provide .means for attaching the refractory material to the plate and for providing a dead air space between the material and plate as an additional safeguard against fire. w

I accomplish the above and other objects 3offi hich will hereinafter appear by, the means exemplified in the accompanying drawing, in which Fig. 1 is a fragment in elevation of the inside wall of a flue. showing mycinvention assembled ;,ready for the expansion of the refractory ma- Referring to the drawing 4 is the flue wallin' which 5 is the flue side, 6 the room side, 7 the 1 flue opening and 8a metal thimble, all and well known construction. I 50.7,: While the flue opening and thimble are here shown circular and regular, for convenience in drafting, they are in practice very often irregu vlar and'out-of-round. I

A sheetmetal wall plate 9 is circular in out- '555 line and is large enough in diameter to reach a v of disc 14 is formed around the bolt hole into rotation by the screw driver.

of usual Further securityagainst fire isinsuredv by the 1 i suitable holding "distance beyond the entrance area of the opening. A bolt hole isfformed at thecenter of the platewithv the metal around the hole ifla'ngedinwardly to provide a counter-fsink '10; to retain the beveled head llfof a screw- 03;; ,bolt 12'whichis inserted through. the hole'inthe ,plate;

Located with? its" edg s. contacting. the, inner. sidejof the plate!) isa cone shaped disc .'13;"

which has .a hole at its aapex thr'ough which the 5.4;

bolt.123 passes.1 V j V v Also mount don the bolt 12 is a second cone disc 14 with'the'slope of .the'cone in opposite direction'jto that of discil3and having an apex new for. the passage of the bolt. Both: discs aw andl are of somewhat :less diameter than the.

normal diameter. off thei flue opening:

'Qna threaded end'of "bolt-12, on the'fiue-side of disc le, is. afnut- 115; am the apex :of *thecon'e a square socket 16," which serves as a seat for the nut 15 to prevent rotation of the nut when bolt '12 is rotated and disc 14 held from rotation. V

Between; the two discs 13 and 14 is. an expansible refractory material 17, here shown as including a compactible-asbestos, but spun glass j l a n he u t expansible refractorymaterial may be used.

Initially the dimensions of the material '17 are such as to be readily irisertablein the flue open-' ring or thimble with its retaining cone discs.

But after such insertion, with the wall; plate 9 against the room wall, the material lfl'is ex- .panded circumferentially as. shown by the dotted lines in Fig. 2,by :moving the two cone discs 13 v and 14 toward each other by the proper 'rota- 1 tion of the screw bolt 12. This is accomplished by the aid of a screw driver; applied. to the m dented headv of the bolt and the screw is turned flue opening or thimble. .The frictionof the disc 14 against the material 1'1 holds the disc from holding of the material 17 out of contact with 1 the plate 9, and also by the creation of a dead- 0 airspace 20 between the plate 9 and disc 13. a

While I have here shown, and'described the best embodiment of my invention now knownto, v me it is obviousthat changes may be madein" the composition of the expansible refractory 1 1 until the "expanded refractory, material com-' I pressivelt'r touches theflue opening, or thimble if there is one, all around; This willfoccur regardless of the irregular or out of round shape of the a terial. e 3. In a stop for a flue opening, an outsidematerial and in the mechanism by which said 2. In a stop for a' flue opening, an outside plate, a plug of expansible heat insulating material in the opening, and means operated from infront of the, plate for expanding the maplate, a mass of expansible heat insulating material in the opening, spaced in the opening from second disc, a resilient heat insulating material ,between the two discs, and a bolt passing through the plate, and means for diametrically expanding the material.

4. In a stop for a flue opening, an outside plate; a -coneshaped disc with its open side towa'rdthe plafteja second cone shaped disc with i'tsiopen side turned awayjfrom the plate, an expansible' heat insulating material between the two discs, and a bolt passing through the plate,

the materialand both discs, saidbolt'being employed to draw the two cones toward each other f to 'compresssaid material'to cause it to expand diametrically into compressive contact with the l circumferential wall of the flue openingf 5. ,In a stop in combination with a fluehaLvingan opening, an outside plate, a'disc' car-, "ried withinthe opening in spacedrelation to the plateto' define a dead air space therebe tween, a plug of compressible, heat insulating, resilient, refractory material back of thedisc, and a second disc back of thematerial, said two discs being adaptedto be drawn compressi'vely against thematerial to cause the material to expand diametrically and resiliently compressively press against the wall of the flue opening.

6. In a stop for a flue opening, an outside plate, a cone shaped disc with its apex turned away from the plate, a second cone shaped disc withits apex turned toward the plate, an expansible heat insulating material between the two discs, and "a bolt passing through the plate, the material and both discs, said bolt being employed to draw the two cones toward each 'othertocompress said material to cause it to expand diametrically into compressive contact with the circumferential wall of the flue opening, both of said discs being of less diameterthanthenormal diameter of the flue opening for which the stop is to be used.

tween the two discsfand a bolt passing through 57 the mat'erial and both discs," said bolt being 7. In a stop for a flue opening, a disc, a

employedto draw the two discs toward each otherto compress said material to cause itto expand diametrically into compressive contact entirely circumferentially around the wall of not the flue opening afiordinga-seal thereby, both of said discs being smaller than the flue' openin'g.

JOHN A. JOHNSON. 

